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Suppose two trains A and B are moving wi...

Suppose two trains A and B are moving with uniform velocities along parallel tracks but in opposite directions. Let the velocity of train A be `40kmh^(-1)` due east and that of train B be `40kmh^(-1)` due west. Calculate the relative velocities of the trains.

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Relative velocity of A with respect to B, `v_(AB)=80kmh^(-1)` due east. Thus to a passenger in train B, the train A will appear to move east with a velocity of `80kmh^(-1)` The relative velocity of B with respect to A, `V_(BA)=80kmh^(-1)` due west.
To a passenger in train A, the train B will appear to move westwards with a velocity of `80kmh^(-1)`
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